A contract between master and servant isn't a simple exchange of mana, doctor.
During intensive situations, your physical health would be negatively impacted. The more mana a Servant needs, the more taxing it is. It is rarely a problem normally, but as a divine spirit, the mana I consume is far above average. And furthermore, outside party could easily perceive this link, painting a target on your back.
Most importantly, there are the command spells. Humans who decide to provide mana do not do so for free. They are awarded three command spells that are capable of temporarily helping or enhancing their Servants. However, those spells can also be used to give a command they absolutely cannot disobey to their Servant.
no subject
During intensive situations, your physical health would be negatively impacted. The more mana a Servant needs, the more taxing it is. It is rarely a problem normally, but as a divine spirit, the mana I consume is far above average. And furthermore, outside party could easily perceive this link, painting a target on your back.
Most importantly, there are the command spells. Humans who decide to provide mana do not do so for free. They are awarded three command spells that are capable of temporarily helping or enhancing their Servants. However, those spells can also be used to give a command they absolutely cannot disobey to their Servant.
Not to speak of the dream sharing.